Axial stretch ratio: 2.4~2.6

Radial stretch ratio: 4~4.5

Total stretch ratio = axial x radial = 8~12 times

Generally, the water bottle is about 16 times, and the hot-filled bottle is about 10 times.

Therefore, the customer’s bottle shape for the customer allows them to provide suitable preforms. If the stretching ratio is not appropriate, the bottle process will be more difficult to adjust, and the process is not stable. It will be more sensitive, and it will change greatly as the ambient temperature changes.

Therefore, the preform is determined by the bottle shape, and the bottle shape must be determined first, and then the preform.